Jirou Tanaka, a former employee of a black company, quits his job due to excessive workload. Upon returning home, he discovers a job application template from a company in another world. The task at hand is to test the dungeon created by the demon king - a challenge that not even the hero can conquer. As a "dungeon tester," Jirou will spend his days delving into the dungeon in an attempt to complete it. He is overseen by his attractive boss, a dark elf with incredible "Magic resistance." Thus begins our protagonist's new life.
